Coaster hub-brake.



C. W. SVENSN'. GoAsTBR HUB BRAKE. APPLICATION FKILBD MAY 1s, 1912.1,@@65 l l a Patented M1229, 193.

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o. W. SVEHHSONl COASTEB. HUB BRAKE.

APPLICATION FILED MAY 1B, 1912 196995,31 L lm-,emmav Apr. 29, 1913'.

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i Enlevement or CHARLES "W. SVENSGN, QF NEVI BRITAIN, CONNECTICUT,ASSIG-NGR TO THE ALERICAN CONNECTCUT.

CONNECTCUT, A COIOBTIFON OF COSTER HUB-BRAKE.

Speeiiication of Letters Patent.

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` Application lea May 1S, 1912. Serial No. 698,185.

To @ZZ wko/m, @'15 may concern:

Ee it kno vn that l, CHARLES YV. SVEN- soir, a citizen of the UnitedStates, residing' at New Britain, county of Hartford. State ofConnecticut, have invented certain new and useful Improvements inCoaster Hub- Bralies, of which the following is a full, clear, and exactdescription.

My invention relates to am improvement in socalled hub-coaster brakes,which iinproveinent is particularly useful when said brake is to beassociated with a power driven bicycle or the like Where-in the utmostcompactness is desired as Well as the greatest efficiency.

in the drawings, Figure 1 is a cent-ral tudinal section of a hub andbrake constructed to embody my invention, said sec tion' being taken onthe plane of the line -a', Fig. *2. Fig. 2 is an end elevation of thebrake., certain parts being removed. 4llig. 3 is a similar view, certainparts removed from Fig. 2 being shown herein.

fl is a side end elevation of a cer-- tain det-ail. 5 is a side and endelevation of another detail. Fig. 'o is a View of detached details.

1 is a central supporting main arbor.

2 represents a hub.

3 is a driver or sprocket, such. as usually employed in starting a motorbicycle by root power. y

i is a driver connected to the hub 3, and such as employed in driving aWheel by ine chanical po'ivf,

55 table clutch mechanism is provided *et'ween the l the hub torconnecting they n one hub when the manually driven. This e presentinstance, com crises a movable clutch 5.

6 is brake actuator for the operation oi 'the brake, which actuator hasa limited rotation ,upon the arbor 1.

The clutch 5 is suitably constructed so that when disengaged from thehub 2, it may be thrown into engagement by the rela tive backwardrotation of the driver 3 with the actuator 6, so that a continued back-Ward rotation of said driver 3 will rotate the actuator G on thespindle 1. This rotation is utilized to operate a brake lever 'i' pivot'iounted opone. fixed er i or "butnient `stfo at one end ot the liub.this 7 by the actuetbr S operates upon a band brake of unique construction. The lever 7 iscomiected at its outer end to one end of abrake strap l0, the other end 11 of said strap 10 being anchored to theplate 9. rIhis strapl() surrbunds a uniquely formed brake drum or barrel12 which latter is rigidly secured to the hub 2. This brake drum 12 isprovided with a groove, prefeil"i V-shaped. The inner Wall of the strap10 is preferably provided With a shoe 14 of leather, fiber or othersuitable material, the cross-section of which is such that whencontracted, it will enter the groove of the brake drum 12 andfrictionally engage the surfaces there-orp to check the rotation of thehub. By this construction, a much greater braking surface can beprovided in a ,given Width than could be provided by a flat vbrake drumof the same Width. Again, by grooving the brake drum When the bralieshoeis contracted thereon, a Wedginp; action takes place which serves toincrease the ,frictional resistance, thereby adding greatly to theeciency of the device.

15 is a cast-off spring which tends to eX- pand the brake strap and freeit from the drum l2 when backward pressure on the driver 3 is released.This spring 15 is preferably mounted upon a guide pin 16 connected tothe movable end of the brake strap and sliding in a suitable socket 17carried by the abutment plate 9 against which abutment plate onel end ofthe cast-oft spring 15 presses. Since the normal tendency of the springis to expand, it throws oli' the brake band and restores the lever 'Z'to its normal inactive position.

l'n the form shoivn, the lever 7 is provided vvith a pin 18 which passesthrough a slot 19 in the abutment plate 9. This pin extends into a slot20 in a crank 21 at the end ot' the brake actuator 6. To prevent dirt.from entering the slot 19, I provide a circular guard 22 piyotallymounted ooncentrically With the arbor 1 and provided with a radial slot23 s` .own in Fig. l and in dotted lines in Fig.`3. This radial slot 23crosses the slot 19, hence, the material of the plate Z2 practicallycovers the unoccupied parts of the slot 19 and protects the interior ofthe hub.

is a pin on the lever arm ".7 which en- ;raoes the movable end of thebrake band.

thus operate in etlect as a key to preventthe lateral displacement ofthe free end of the brake strap on the' pin 25. To secure the mosteffect-ive results, the pin passage through the movable end of the brakestrap should be radially enlarged so as to permitl the adjacent part ofthe brake strap to move toward the aXis of the hub and thus clutchevenly upon the brake drum when the lever 7 is being manually operated.In the drawings, l have shown the lever 7 approximately midway in thelength'of its throw, in which position it may be assumed that the brakeband is being lightly applied to the brake drum. As will be seen, theslot 19 affords clearance on either side' so that the lever '7 may swingin a direction to release the brake entirely, or may swing in theopposite direction to apply the brake even more powerfully. A verysimple and effectivemeans for securing a quick adjustment for the brakeband is shown herein,

Awherein the abutment plate 9 is provided with a slot 2S) -for receivinga bolt 3G, which passes through the fixed end ot the brake band, asshown in Fig. 2, for the purpose of anchoring the same. The bolt may beheld in any part of the slot 29 by a nut 3l Iso that by shifting theposition of the pin in the slot, the fixed end of the brake strap mayloe-shifted. This is particularly advantageous when the brake strapwears down, since it affords a. simple means for taking up said wear.The direction of the slot 29 is obviously approximately circumferent-iairelatively to the brake drum.

The guard 22 is preferably cup-shaped, shown, so as to overstand theinner end of the hub and thereby further protect the same.

In operation, a back pedaling movement on driver 3 imparts acorresponding movement to the part 6, which in turn engages that part ofthe brake lever which enters the hub, and moves it in a direction tocontract the brake, applying the necessary resistance to retard, and itnecessary check,

the forward rotation of4 the wheel hub.

VWhat I claim is:

l. In a hub brake, a hub, a 'groove brake drum carried thereby, a brake`handv ranged to engage the brake drum in said groove and normallyloosely surrounding the same, means for operating said brake bandcomprising a stationary abutment. to which o-ne end of said band isanchored, `a lever carried by said abutment and operatively oonnectedwith the other end of said band, part ofA said lever projecting intosaid hub, and means in the hub for engaging that ltively connected withthe other end of said band, part of said lever projecting into saidhubI- means partly contained in the hub for engaging that part oi' saidlever within said hub to more it in a direction to contract the band onsaid drum, and means for adjusting the position oit the anchored end ofsaid brake band.

3. ln a hub brake, a hub, a brake drum` carried thereby, a brake bandarranged to engage the brake drum and normally loosely surrounding thesame, means for operating said brake band comprising a stationaryabutment` to which one end of said band is anchored, a lever carried bysaid abutmentand operatively connected with the other end oi'said band,part ci said lever project# ing toward said hub, means partly containedin the huh for 'engaging said lever to move it in a direction tocontract the band on said drum', and means normally expanding said brakeband comprising a spring pressing'at one end against the movable end ofsaid band, and at the other end against the same part to which the fixedend of the band is anchored.

4. In a hub brake.' a hub, a brake drum carried thereby, a brake bandarranged to engage the brake drumand normally loosely Surrounding thesame, means for operating said brake band comprising a stationaryabutment to which one end of said band is anchored7 a lever carried bysaid abutment and operatively connected with the other end of said band,part of said lever projecting toward said hub, means partly contained inthe hub for engaging said lever to move it in a direction tocontract theband on said drum, means normally expanding said brake band comprising aspring pressing at one end against the movable end of said band, and at.the other end against the same part to which the xed end of the band isanchored, and a guide pin for said spring,

5. In a hub brake, ahub, a brake drum carried thereby, a brake bandarranged to engage the brake drum and normally loosely surrounding thesame, means for operating said brake band comprising a stationaryabutmentto which oneend of said band is anchored, a lever carried bysaid abutment and operatively connected. with the'other end of saidband, partof said lever projecting toward said hub, means partlycontained in the hub for engaging said lever to move it in a directionto contract the band on said drum, means normally expanding said brakeband comprising a spring pressing at one end against. the movable end o1said band, and at the other end against the same partto which the fixedend ot' the band is anchored, and a guide pin for said spring7 saidguide pin also holding said lever against accidental disengagement fromthe movable end of said brake band.

6. In a hub brake, a hub, a brake drum carried thereby, a stationaryabutment, a brake band anchored at one end ot' said abut.- ment andsurrounding said drum, a lever pivotally mounted on said abutment. and

operatively engaging the unanehored end of said brake band, a pin onsaid lever, said stationary abutment having a slot through which saidpin projects into the space within the circumference of said drum, andmeans engaging said pin and manually operable to swing said lever.

7. In a hub brake, a hub, a brake drinn carried thereby, a stationaryabutment, a brake band anchored at one end of said abutment andsurrounding said drum, a lever pivotally mounted on said abut-ment andoperatively engaging the unanchored end ot said brake band, a pin onsaid lever,

said stationary abutmenthaving a Slot through which said pin projectsinto the space within the circumference of said drum, and means engagingsaid pin and manually operable to swing said lever, said manuallyoperable means extending through said hub to the opposite end thereof.

8. ln a hub brake, a hub, a brake drum carried thereby, a stationaryabutment, a brake band anchored at one end ot' said abutment andsurrounding said drum, a lever pivotally mounted on said abutment andoi'ieratively engaging the unanchored end of said brake band, a` pin onSaid lever, said Stationary abutment having a slot through which saidpin projects into the space With CHARLES lV. S'VENSN.

Witnesses R. C. MrroHnnL, GEO. E. Senna.

